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JEE Main 2021 Aug 26 Shift 1 Question Paper with Solution PDF- Download Here

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Content Curator updated | Updated On - Mar 7, 2023

JEE Main 2021 B.E./B.Tech August 26, 2021 Forenoon Question Paper was rated to be a little easier than the previous exam (July 27) and was overall moderate in terms of difficulty. The paper was the first paper of the JEE Main 4th session in 2021. Physics was the most difficult section of the paper, followed by Chemistry. Mathematics was the easiest of the three sections, with direct formula-based questions. Approximately 48 Questions were asked from class XII and 42 questions were from class XI JEE Main syllabus. August 26, 2021 Shift 1 Question Paper and Answer Key are available at the links given below for JEE Main 2022 aspirants.

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JEE Main B.E./B.Tech Question Paper- August 26, 2021 Forenoon

JEE Main 2021 Question Paper	JEE Main 2021 Answer Key
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JEE Main 2021 B.E./B.Tech Question Paper August 26 (FN): Weightage of Topics

JEE Main 2021 B.E./B.Tech Paper on August 26 Forenoon Session was conducted between 9.00 AM to 12.00 Noon. The topics with the highest weightage in the question paper are:

Subject	Topic	Marks (including NATs)
Physics	Current Electricity	12
	Electrostatics	8
	Heat and Thermodynamics	12
	Rectilinear motion and vectors, Unit and Dimensions, Surface Tension	24 (8 marks each)
	Atomic Physics	12
Chemistry	d block and f block elements	8
	Hydrocarbons	8
	Polymers	8
	Electrochemistry	8
	Mole Concept	8
Mathematics	Coordinate Geometry	12
	Differential Calculus	8
	Integral Calculus	12
	Vectors	8
	Matrices and Determinants	8

JEE Main 2021 Questions

1	According to Bohr's atomic theory :- (A) Kinetic energy of electron is ∝Z²/n². (B) The product of velocity (v) of electron and principal quantum number (n), 'vn' ∝Z². (C) Frequency of revolution of electron in an orbit is ∝Z³/n³. (D) Coulombic force of attraction on the electron is ∝Z³/n⁴. Choose the most appropriate answer from the options given below:
2	Complete combustion of 1.80g of an oxygen containing compound (C_xH_yO₂) gave 2.64g of CO₂ and 1.08g of H₂O. The percentage of oxygen in the organic compound is:
3	Out of the following, which type of interaction is responsible for the stabilisation of ∝ -helix structure of proteins?
4	(A) HOCl + H₂O₂→ H₃O⁺+ Cl⁻+ O₂ (B) I₂+ H₂O₂+ 2OH⁻ → 2I⁻ + 2H₂O + O₂ Choose the correct option.
5	Which of the following equation depicts the oxidizing nature of H₂O₂?
6	Given below are two statements: Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame. In the light of the above statements, choose the most appropriate answer from the options given below.
7	Which of the following reaction/s will not give p− aminoazobenzene?
8	In the given figure, the energy levels of hydrogen atom have been shown along with some transitions marked $A , B , C , D$ and $E$. The transitions $A, B$ and $C$ respectively represent :
9	Four identical particles of equal masses $1 kg$ made to move along the circumference of a circle of radius $1 m$ under the action of their own mutual gravitational attraction. The speed of each particle will be :
10	If an emitter current is changed by $4 mA ,$ the collector current changes by $3.5 mA$. The value of $\beta$ will be
11	Match List -I with List -II
12	Each side of a box made of metal sheet in cubic shape is 'a' at room temperature 'T', the coefficient of linear expansion of the metal sheet is ' $\alpha^{\prime}$. The metal sheet is heated uniformly, by a small temperature $\Delta T ,$ so that its new temperature is $T +\Delta T$. Calculate the increase in the volume of the metal box.
13	A cube of side 'a' has point charges $+ Q$ located at each of its vertices except at the origin where the charge is $-Q$. The electric field at the centre of cube is:
14	If $Y, K$ and $\eta$ are the values of Young's modulus, bulk modulus and modulus of rigidity of any material respectively. Choose the correct relation for these parameters.
15	Two equal capacitors are first connected in series and then in parallel. The ratio of the equivalent capacities in the two cases will be:
16	An LCR circuit contains resistance of $110 \Omega$ and a supply of $220 V$ at $300 rad / s$ angular frequency. If only capacitance is removed from the circuit, current lags behind the voltage by $45^{\circ} .$ If on the other hand, only inductor is removed the current leads by $45^{\circ}$ with the applied voltage. The $rms$ current flowing in the circuit will be :
17	Calgon is used for water treatment. Which of the following statement is $NOT$ true about Calgon?
18	Statements about heavy water are given below A. Heavy water is used in exchange reactions for the study of reaction mechanisms B. Heavy water is prepared by exhaustive electrolysis of water C. Heavy water has higher boiling point than ordinary water D. Viscosity of $H _{2} O$ is greater than $D _{2} O$
19	Given below are two statements : Two photons having equal linear momenta have equal wavelengths. If the wavelength of photon is decreased, then the momentum and energy of a photon will also decrease. In the light of the above statements, choose the correct answer from the options given below.
20	In Freundlich adsorption isotherm, slope of AB line is :
21	In the given figure, a mass $M$ is attached to a horizontal spring which is fixed on one side to a rigid support. The spring constant of the spring is $k$. The mass oscillates on a frictionless surface with time period $T$ and amplitude $A$. When the mass is in equilibrium position, as shown in the figure, another mass $m$ is gently fixed upon it. The new amplitude of oscillation will be :
22	The correct order of bond dissociation enthalpy of halogens is :
23	Which of the following are isostructural pairs? A. $SO _{4}^{2-}$ and $CrO _{4}^{2-}$ B. $SiCl _{4}$ and $TiCl _{4}$ C. $NH _{3}$ and $NO _{3}^{-}$ D. $BCl _{3}$ and $BrCl _{3}$ $BCl _{3}$ and $BrCl _{3}$

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JEE Main 2022 Physics Preparation	JEE Main 2022 Chemistry Preparation	JEE Main 2022 Mathematics Preparation

JEE Main B.E/ B. Tech Previous Year Question Paper with Answer Key PDFs

JEE Main 2022 aspirants can download the PDFs for the previous year solved question paper from the links below.

JEE Main 2020 Question Paper	JEE Main 2019 Question Paper	JEE Main 2018 Question Paper
JEE Main Physics Question Paper	JEE Main Maths Question Paper	JEE Main Chemistry Question Paper

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*The article might have information for the previous academic years, please refer the official website of the exam.

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